[1]} get a total reddening of \(E(B-V) = 0.18\)  by applying the Chołoniewski method to the \(2003 - 2004\)  photometry of [2]} and assuming that the unreddened colour of the variable component is given by a \(F_{\nu } \propto \nu ^{+1/3}\)  power law. Similarly, [3]}, from their photometry obtained over the period \(2001 - 2007\) , get \(E(B-V) = 0.13\) .
